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Standard XII

Physics

Reverse Bias

separation be...

Question

separation between the charges is r points A is at distance r from -q B is at a distance of r from +q charge and c is the distance mid point find the net electric field A,B,C

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Q. Write the definition of electric potential. Calculate the electric potential due to a point charge Q at a distance r from it. Draw a graph between electric potential V and distance r for a point charge Q.

Q. A charge ‘q’ is placed at the centre of a conducting spherical shell of radius

R

, which is given a charge 'Q'. An external charge Q' is also present at distance

R^{'} (R^{'} > R)

from ‘q’. Then the resultant electric field will be best represented for region

r

> R by: (where

r

is the distance of the point from q)

Q. A non conducting sphere of radius

^{'} a^{'}

has a type charge

^{'} + q^{'}

uniformly distributed throughout in volume. A hollow spherical conductor having inner and outer, radii

^{'} b^{'}

and

^{'} c^{'}

and net charge

^{'} - q^{'}

is concentric with the sphere (see the figure)
Read the following statements
(i) The electric field at a distance

r

from the center of the sphere

= \frac{1}{4 π ε_{0}} \frac{q r}{a^{3}}

for

r < a

.
(ii) The electric field at distance

r

from the center of the sphere for

a < r < b = 0

(iii) The electric field at distance

r

from the center of the sphere for

b < r < c <= 0

(iv) The charge on the inner surface of the hollow sphere

= - q

(v) The charge on the outer surface of the hollow sphere

= + q

Q. A charge

q

is placed at the centre of a conducting spherical shell of radius

R,

which is given a charge

Q .

An external charge

Q^{'}

is also present at distance

R^{'} (R^{'} > R)

from

q^{'} .

Then the resultant field will be best represented for region

r < R

is-
[where

r

is the distance of the point from

q

]

A ring of radius R is charged uniformly with a charge +Q. The electric field at a point on its axis at a distance r from any point on the ring will be:-

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